Score: 0
Coherence READY
Time: 90
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About Double Slit Duel

Fire photons and electrons through slits and bend the interference pattern in this free online quantum mechanics game about wave particle duality.

Double Slit Duel is a free online quantum mechanics game built around the most famous experiment in physics. An emitter fires electrons and photons one particle at a time toward a barrier with two slits. Left alone, each particle lands on the detector screen according to a probability wave, and over many shots the hits pile up into bright and dark stripes: the interference pattern that proves matter behaves like a wave.

The villains in the field are real quantum effects. Detector Drones and Observer Scopes represent which-path measurement: the instant an experiment reveals which slit a particle used, the wavefunction collapses and the fringes wash out into two dull classical bands. Decoherence Dust models the stray air molecules and photons that leak information into the environment, which is why real quantum hardware lives in vacuum chambers near absolute zero. Your Quantum Eraser mirrors actual delayed-choice quantum eraser experiments, where erasing which-path data restores interference. Tunnel Barriers demonstrate quantum tunneling, the phenomenon that lets alpha particles escape nuclei and powers scanning tunneling microscopes and flash memory. Entangled pairs collapse together because their shared quantum state cannot be described independently, the spooky correlation Einstein doubted and Bell test experiments confirmed.

These ideas are not just curiosities. Superposition and entanglement power quantum computers, tunneling drives fusion in the Sun and the flash chips in your phone, and decoherence is the central engineering obstacle in quantum technology. Mastering this lab is a first step toward understanding the strange rules of the very small.

Key Science Concepts

What You'll Learn

Grade Level: Middle School, High School, College

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How to play

  1. Waves on the Way The emitter fires electron and photon waves that pass through both slits and land on the detection screen as bright fringes.
  2. Sweep the Watchers Steer your Quantum Eraser with mouse or touch. Bump Detector Drones, Observer Scopes and Dust to scatter them before they observe a wave.
  3. Collapse or Coherence Observed waves turn gray and land as boring classical hits. Touch a gray wave with the Eraser to restore its superposition.
  4. Harvest Coherence Grab drifting Coherence Crystals to refill the meter. If Coherence hits zero the whole experiment decoheres. Tap the gauge for a Vacuum Purge.
  5. Guard the Pairs Entangled twins share one fate: if either is seen, both collapse instantly. Keep both unseen to the screen for a Bell bonus.
  6. Trust the Tunnel Waves striking a Tunnel Barrier may leak straight through for bonus points. Alpha particles always tunnel. Chain hits for a Superposition Surge.
  7. Steer the Waves Tap a coherent wave to phase-kick it up or down. Skim past drones for Graze bonuses and chase Golden Photons before the Measurement Storm hits.

Frequently asked questions

Is Double Slit Duel free to play?
Yes. Double Slit Duel is completely free to play in your browser. There is no download, install or account needed.
What grade level is Double Slit Duel for?
Double Slit Duel is designed for Middle School, High School, College students and works well as a classroom activity or homework.
Does Double Slit Duel work on phones and tablets?
Yes. Double Slit Duel runs in any modern browser on desktop computers, Chromebooks, tablets and phones in landscape mode.

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